The calculated distance (air line) between Si Sa Ket and Ubon Ratchathani is approximately 36 miles respectively 57 kilometers.
By car or train, the actual journey to Ubon Ratchathani is certainly longer, as only the direct route (as the crow flies) between Si Sa Ket and Ubon Ratchathani has been calculated here.
Air line (approximately)
57 kilometers
31 nautical miles